Littorella

Taxobox
name = "Littorella"

---

image_width = 250px
regnum = Plantae
divisio = Magnoliophyta
classis = Magnoliopsida
ordo = Lamiales
familia = Plantaginaceae
genus = "Littorella"
genus_authority = (L.) Asch.
subdivision_ranks = Species
subdivision = "L. uniflora" "L. americana" "L. australis"

"Littorella" is a genus of twocite web | url = http://www.efloras.org/florataxon.aspx?flora_id=60&taxon_id=118758 | title = Littorella L. | work = Flora of Chile | pages = 125–126] to threecite journal | url = http://www.amjbot.org/cgi/content/full/90/3/429 | title = Molecular systematics and biogeography of the amphibious genus Littorella (Plantaginaceae) | author = Ronald K. Hoggard, Paul J. Kores, Mia Molvray, Gloria D. Hoggard and David A. Broughton | journal = American Journal of Botany | year = 2003 | volume = 90 | pages = 429–435 ] species of aquatic plants. Many plants live their entire lives submersed, and reproduce by stolons, but some are only underwater for part of the year, and flower when they are not underwater.

Classification

Molecular data show "Littorella" to be sister to the rest of the genus "Plantago". Thus, cladistics would allow it to be considered either as a separate genus or as part of "Plantago". [Albach, D. C., Meudt, H. M. & Oxelman, B. 2005. [http://www.amjbot.org/cgi/content/full/92/2/297 Piecing together the "new" Plantaginaceae] . "American Journal of Botany" 92: 297-315.] Some researchers, particularly Rahn in the 1990s, have considered "Littorella" to be located within "Plantago", but this does not seem to be required given the molecular data and a closer look at morphology.

Species

*"Littorella uniflora". Found in Europe from Iceland to the black sea.
*"Littorella americana" from northern North America.
*"Littorella australis" from patagonia, in southern Chile and Argentina, and the Falkland Islands

Some authors have treated "L. uniflora" and "L. americana" to be one species, but molecular data show "L. americana" to be more closely related to "L. australis" than it is to "L. uniflora", which argues for recognizing three species. Other considerations, such as the wider range and more frequent flowering of "L. uniflora", also argue for separate species. It seems likely that the genus originated in Europe and first spread to North America, and from there to South America, with both events happening in the Pleistocene or later.

Distribution

The European species is found in a wide range of habitats, from arctic to Mediterranean. The North and South American species are found in a more limited range of temperate climates.

References

External links

* [http://plants.usda.gov/java/profile?symbol=LITTO PLANTS profile]